Combine harvester hydraulic control circuit

Abstract

In the hydraulic control drive circuit of a combine harvester, which has a solenoid valve positioned on top of an aluminum manifold with an internal check valve, there were challenges such as increased pressure loss due to the complex oil passages connecting the solenoid manifold and high costs due to the larger size of the valve. [Solution] The harvesting lifting cylinder 24 and the auger lifting cylinder 25 are single-acting hydraulic cylinders, while the left rolling cylinder 26, the right rolling cylinder 27, and the pitching cylinder 28 are double-acting hydraulic cylinders. The auger lifting cylinder 25, the left rolling cylinder 26, the right rolling cylinder 27, and the pitching cylinder 28 are each equipped with an integrated valve unit 31 which consists of electromagnetic switching valves 29a, 29b, 29c, 29d, 29e and check valves 30a, 30b, 30c, 30d, 30e. The valve unit 31 is configured so that a part of the body can be modified.

Description

Technical Field

[0001] The present invention relates to a hydraulic control drive circuit for a combine harvester having a valve unit in which a solenoid switching valve and a check valve for driving hydraulic equipment mounted on the combine are integrally formed.

Background Art

[0002] Patent Document 1 discloses a hydraulic control drive circuit for a combine harvester that can quickly correct the left - right level of the vehicle body even when the left - right weight balance of the vehicle body changes during the harvesting operation while maintaining the level of the vehicle body traveling by hydraulic control.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the hydraulic control drive circuit of the combine harvester of Patent Document 1, the solenoid valve is arranged above the aluminum manifold with the check valve installed inside. In such a configuration, the oil passage connecting the solenoid manifold becomes complex, resulting in problems such as an increase in pressure loss and high costs due to the enlargement of the valve.

Means for Solving the Problems

[0005] The problems of the present invention are solved by the following technical means.

[0006] The invention described in claim 1 is a hydraulic unit (20) for a combine harvester comprising an oil tank (21), a hydraulic pump (22), and a hydraulic control circuit (23), wherein oil from the hydraulic pump (22) is sent via the hydraulic control circuit (23) to a harvesting lifting cylinder (24), an auger lifting cylinder (25), a left rolling cylinder (26), a right rolling cylinder (27), and a pitching cylinder (28), wherein the harvesting lifting cylinder (24) and the auger lifting cylinder (25) are single-acting hydraulic cylinders, and the left rolling cylinder (26) and the right rolling cylinder (27) The combine harvester hydraulic unit is characterized in that the Linda (27) and the pitching cylinder (28) are composed of double-acting hydraulic cylinders, and a valve unit (31) is provided which integrates electromagnetic switching valves (29a, 29b, 29c, 29d, 29e) and check valves (30a, 30b, 30c, 30d, 30e) that supply oil to the auger lifting cylinder (25), the left rolling cylinder (26), the right rolling cylinder (27), and the pitching cylinder (28), respectively, and the valve unit (31) is configured to allow modification of a part of the body.

[0007] The invention described in claim 2 is a hydraulic unit for a combine harvester according to claim 1, characterized in that the neutral ports of the electromagnetic switching valves (29a, 29b, 29c, 29d, 29e) are made into blocks by body processing, and the single-acting hydraulic cylinder is made into a tank port connection circuit by modifying the body processing.

[0008] The invention described in claim 3 is a hydraulic unit for a combine harvester according to claim 1 or 2, characterized in that a sensor electromagnetic switching valve (32) is provided to switch the supply of pressurized oil to the electromagnetic switching valve connected to the left rolling cylinder (26) and the electromagnetic switching valve connected to the right rolling cylinder (27) using a tilt sensor, and when the electromagnetic switching valves (29c, 29d) that supply oil to the left rolling cylinder (26) and the right rolling cylinder (27), respectively, are in the neutral position, they are configured to unload the oil to the electromagnetic switching valve (29e) that supplies oil to the pitching cylinder (28), and when the electromagnetic switching valve (29e) that supplies oil to the pitching cylinder (28) is in the neutral position, it is configured to be in a blocked state. [Effects of the Invention]

[0009] According to the present invention, a derivative model of a valve unit that integrates a switching solenoid valve and a check valve set in the combine harvester is used, and since the valve unit only requires a change in the machining of a part of the body it comprises, the body material of the valve unit, the check valve, and the switching spool can be shared, making it easy to change the design and reduce costs even for combine harvesters of different models. [Brief explanation of the drawing]

[0010] [Figure 1] This is a right side view of a combine harvester according to an embodiment of the present invention. [Figure 2] This is a plan view of a combine harvester according to an embodiment of the present invention. [Figure 3] This is an overall diagram of a hydraulic control circuit according to an embodiment of the present invention. [Figure 4] This is a solenoid valve unit according to an embodiment of the present invention. [Figure 5] This is a diagram of a vehicle body control circuit according to Embodiment 1 of the present invention. [Figure 6] This is a diagram of a vehicle body control circuit according to Embodiment 2 of the present invention. [Figure 7] This is a diagram of a vehicle body control circuit according to Embodiment 3 of the present invention. [Figure 8]This is a diagram of a vehicle body control circuit according to Embodiment 4 of the present invention. [Figure 9] This is a diagram of a vehicle body control circuit according to Embodiment 5 of the present invention. [Figure 10] This is a diagram of a vehicle body control circuit according to Embodiment 6 of the present invention. [Figure 11] This is a valve unit according to an embodiment of the present invention. [Modes for carrying out the invention]

[0011] Embodiments of this invention will be described below with reference to the drawings.

[0012] As shown in Figures 1 and 2, the combine harvester has a running device 2 consisting of a pair of left and right crawlers that travel on the soil surface on the underside of the machine frame 1, a harvesting device 3 for cutting grain stalks in the field on the front side of the machine frame 1, a threshing device 4 for threshing and sorting the harvested grain stalks located to the rear left of the harvesting device 3, and a control unit 5 for the operator to sit in, located to the rear right of the harvesting device 3.

[0013] Below the control unit 5 is an engine room 6 where the engine is mounted, and behind the control unit 5 is a grain tank 7 for storing threshed and sorted grain. Behind the grain tank 7 is a discharge auger 8 consisting of a vertically extending grain lifting section and a horizontally extending front-to-back discharge section for discharging the grain to the outside.

[0014] A touch-panel monitor 11 that displays the travel speed of the travel device 2 is provided in the center of the front panel in front of the cockpit of the control unit 5, and an operating lever 12 for operating the turning of the travel device 2 and the raising and lowering of the harvesting device 3 is provided to the right of the monitor 11.

[0015] A gear shift lever 16 for increasing or decreasing the speed of the travel device 2 is provided on the front of the left side panel of the cockpit of the control unit 5, and an inertial measuring device 17 is provided behind the gear shift lever 16. This allows for the measurement of the yawing angle, rolling angle, and pitching angle of the aircraft frame 1.

[0016] The machine body frame 1 changes the inclination in the front-rear direction with a pitching cylinder 28 (Fig. 3) with respect to the traveling device 2 to make the front-rear direction horizontal, and changes the inclination in the left-right direction with left and right rolling cylinders 26, 27 (Fig. 3) to make the left-right direction horizontal.

[0017] Fig. 3 is an overall view of a hydraulic control circuit diagram. The pressure oil sent by a hydraulic pump 22 branches into a flow to a pressure reducing valve and a flow priority valve and a flow of the pressure reducing valve. The pressure oil sent from the flow priority valve branches into a pilot operation system oil path and a machine body operation system oil path.

[0018] In the machine body operation system oil path, as shown in Fig. 3, a mowing up-down flow control valve 5 is used to connect a mowing lifting cylinder 29 and an auger lifting cylinder 30, a left rolling control valve is used to connect a left rolling cylinder 31, a right rolling control valve is used to connect a right rolling cylinder 32, and a pitching control valve is used to connect a pitching cylinder 33.

[0019] The solenoid valve unit shown in Fig. 4 is a valve unit in which solenoid switching valves 29a, 29b, 29c, 29d, 29e and check valves 30a, 30b, 30c, 30d, 30e are integrally formed respectively. The valve unit 31 of the solenoid valve unit is configured such that a part machining of the constituting body can be changed. By sharing the body material, check valves, and switching spools of the valve unit 31 of the solenoid valve unit, the cost reduction of the hydraulic unit of the combine can be achieved.

[0020] <Embodiment 1> Figure 5 shows a hydraulic circuit of Embodiment 1 of the present invention, in which the vehicle body control system hydraulic circuit is configured to unload the supply flow rate to the pitching control unit when the left and right rolling control units are in the neutral position. Specifically, when the electromagnetic switching valves 29c and 29d that supply oil to the left rolling cylinder 26 and the right rolling cylinder 27, respectively, are in the neutral position, the flow rate is unloaded to the electromagnetic switching valve 29e that supplies oil to the pitching cylinder 28. Also, when the electromagnetic switching valve 29e that supplies oil to the pitching cylinder 28 is in the neutral position, it is in a blocked state. This makes it possible to reduce costs by sharing parts of the hydraulic units of different combine harvesters.

[0021] <Embodiment 2> Figure 6 shows a hydraulic circuit according to Embodiment 2 of the present invention. When controlling the vehicle height, the SOL1.b of the sensor electromagnetic switching valve 32 is energized, and pressurized oil is not supplied to the pitching control unit. Horizontal and vertical control is performed by simultaneously energizing either the a or b side of SOL2 and SOL3, and when the energization of SOL2 or SOL3 is turned OFF, the system switches from SOL1.b to SOL1.a. As a result, the inlet to the pitching control unit does not become a high-pressure line, and the hydraulic circuit can be prioritized for rolling.

[0022] <Embodiment 3> Figure 7 shows a hydraulic circuit according to Embodiment 3 of the present invention. When controlling the vehicle height, energizing SOL1.b of the sensor electromagnetic switching valve 32 allows all control units to become high-voltage lines.

[0023] <Embodiment 4> Figure 8 shows a hydraulic circuit according to Embodiment 4 of the present invention. Even when rolling control is being performed on either the left or right side, the other rolling and pitching control unit also has a high-voltage line, allowing simultaneous control of the other rolling and pitching unit.

[0024] <Embodiment 5> Figure 9 shows a hydraulic circuit according to Embodiment 5 of the present invention. In this configuration, pressurized oil is not supplied to the pitching control unit while rolling control is being performed simultaneously on both sides, thereby prohibiting simultaneous pitching operation and creating a rolling priority circuit.

[0025] <Embodiment 6> The upper diagram of Figure 10 shows a hydraulic circuit of Embodiment 6 of the present invention. With SOL1.b energized, left rolling and pitching control can be operated simultaneously, and since the supply lines to the control unit are separated, both can move normally. Similarly, the lower diagram of Figure 10 also shows a hydraulic circuit of Embodiment 6 of the present invention, with SOL1.b energized, right rolling and pitching control can be operated simultaneously, and since the supply lines to the control unit are separated, both can move normally.

[0026] <Embodiment 7> Figure 11 shows a valve unit with the solenoid valve unit connection configuration shown in Figure 4, but with only auger control and body control. As shown in Figure 11, by sharing the integrated block of the travel section, unloading section, and upper and lower harvesting section with other combine harvester models, the rate of parts commonality can be improved and unnecessary cost increases can be suppressed. [Explanation of symbols]

[0027] 1. Aircraft frame 2. Traveling device 3 Reaping device 4. Threshing machine 5. Control Unit 7 Glen Tank 6. Engine Room 8. Discharge Auger 11 monitors 12 Operating levers 16 gear levers 21 Oil tanks 22 Hydraulic pumps 23. Hydraulic control circuit 24 Harvesting Lifting Cylinder 25 Auger Lifting Cylinder 26 Left Rolling Cylinder 27 Right Rolling Cylinder 28 Pitching Cylinder 31 Solenoid valve unit 32 Sensor-operated electromagnetic switching valve 40 Valve Unit

Claims

1. In a combine harvester's hydraulic unit (20) comprising an oil tank (21), a hydraulic pump (22), and a hydraulic control circuit (23), the hydraulic unit (20) sends oil from the hydraulic pump (22) to the harvesting lifting cylinder (24), the auger lifting cylinder (25), the left rolling cylinder (26), the right rolling cylinder (27), and the pitching cylinder (28) via the hydraulic control circuit (23), The harvesting lifting cylinder (24) and the auger lifting cylinder (25) are composed of single-acting hydraulic cylinders. The left rolling cylinder (26), the right rolling cylinder (27), and the pitching cylinder (28) are composed of double-acting hydraulic cylinders. The system includes a valve unit (31) which is an integrated configuration of electromagnetic switching valves (29a, 29b, 29c, 29d, 29e) and check valves (30a, 30b, 30c, 30d, 30e) that supply oil to each of the auger lifting cylinder (25), the left rolling cylinder (26), the right rolling cylinder (27), and the pitching cylinder (28), respectively. The hydraulic unit for a combine harvester is characterized in that the valve unit (31) is configured to allow modification of a part of the body.

2. The neutral ports of the aforementioned electromagnetic switching valves (29a, 29b, 29c, 29d, 29e) are made into blocks by body processing. The hydraulic unit for a combine harvester according to claim 1, characterized in that the single-acting hydraulic cylinder is configured as a tank port connection circuit by modifying the body processing.

3. A sensor-controlled electromagnetic switching valve (32) is provided that switches the supply of pressurized oil to the electromagnetic switching valve connected to the left rolling cylinder (26) and the electromagnetic switching valve connected to the right rolling cylinder (27) using a tilt sensor. When the solenoid directional control valves (29c, 29d) that supply oil to the left rolling cylinder (26) and the right rolling cylinder (27), respectively, are in the neutral position, they are configured to unload the oil to the solenoid directional control valve (29e) that supplies oil to the pitching cylinder (28). The hydraulic unit for a combine harvester according to claim 1 or 2, characterized in that the electromagnetic switching valve (29e) that supplies oil to the pitching cylinder (28) is in a blocked state when it is in the neutral position.

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